Adding author information to AuditListView

Summary:
Adding the Author to the home page and Audit overview page,
so that at a glance you can see who authored the commits
that need to be audited

Test Plan: View home page and audit overview page and see that author is shown

Reviewers: Blessed Reviewers, epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8438